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I used a hair dryer on a few of mine before the hot summer days came. The only problem I had with that was running the power out to where I needed it. Can't run those energy hogs on a long extension cord without either blowing a fuse/breaker, or melting the cord itself.
Blow torch also. Be careful not to melt the pipe though or you'll warp it, or make it weak. You don't want to put it too close to the pipe.

I'm no expert..........YET! I just like to suggest things and learn... See what the pro's have to say first.

Propane torch with the click ignitor. I would evenly heat 2 or 3 ends at a fitting, slip them on, let them cool, and then crimp the clamps. They don't need much heat, maybe only a few seconds. If you overheat you can weaken the plastic too much and it will kink or twist. On a hot day in the sun you don't even need a torch. Funny pipe I didn't heat at all.

When you use the hairdryer, make sure you use at least a minimum #14 gauge extension cord. If it is over 25ft, then use a #12 gauge.
I tried a #16 gauge cord only 25ft away from the outlet, and the plug and wire melted on my cord. The #14 gauge just got very warm at 25ft. Over that, the voltage got too low for it to work, and everything overheated and the breaker tripped.
I used a #12 gauge extension cord, 50ft away, and it stayed cool, and ran fine. They are a bit pricey in the store, but worth it for many other powertools. You'd be surprised at how well your tools would run on a #12 gauge, compared to a #16 gauge. Big difference in power, and alot less strain on the motor.
Experienced it, went through it, almost burnt up the house.

I'm no expert..........YET! I just like to suggest things and learn... See what the pro's have to say first.